Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / hwmon / lm73.c

diff --git a/qemu/roms/u-boot/drivers/hwmon/lm73.c b/qemu/roms/u-boot/drivers/hwmon/lm73.c
new file mode 100644 (file)
index 0000000..c15c751
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/hwmon/lm73.c
@@ -0,0 +1,146 @@
+/*
+ * (C) Copyright 2007-2008
+ * Larry Johnson, lrj@acm.org
+ *
+ * based on dtt/lm75.c which is ...
+ *
+ * (C) Copyright 2001
+ * Bill Hunter,  Wave 7 Optics, williamhunter@mediaone.net
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+/*
+ * National Semiconductor LM73 Temperature Sensor
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <dtt.h>
+
+/*
+ * Device code
+ */
+#define DTT_I2C_DEV_CODE 0x48  /* National Semi's LM73 device */
+#define DTT_READ_TEMP          0x0
+#define DTT_CONFIG             0x1
+#define DTT_TEMP_HIGH          0x2
+#define DTT_TEMP_LOW           0x3
+#define DTT_CONTROL            0x4
+#define DTT_ID                 0x7
+
+int dtt_read(int const sensor, int const reg)
+{
+       int dlen;
+       uint8_t data[2];
+
+       /*
+        * Validate 'reg' param and get register size.
+        */
+       switch (reg) {
+       case DTT_CONFIG:
+       case DTT_CONTROL:
+               dlen = 1;
+               break;
+       case DTT_READ_TEMP:
+       case DTT_TEMP_HIGH:
+       case DTT_TEMP_LOW:
+       case DTT_ID:
+               dlen = 2;
+               break;
+       default:
+               return -1;
+       }
+       /*
+        * Try to read the register at the calculated sensor address.
+        */
+       if (0 !=
+           i2c_read(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data, dlen))
+               return -1;
+       /*
+        * Handle 2 byte result.
+        */
+       if (2 == dlen)
+               return (int)((unsigned)data[0] << 8 | (unsigned)data[1]);
+
+       return (int)data[0];
+} /* dtt_read() */
+
+int dtt_write(int const sensor, int const reg, int const val)
+{
+       int dlen;
+       uint8_t data[2];
+
+       /*
+        * Validate 'reg' param and handle register size
+        */
+       switch (reg) {
+       case DTT_CONFIG:
+       case DTT_CONTROL:
+               dlen = 1;
+               data[0] = (uint8_t) val;
+               break;
+       case DTT_TEMP_HIGH:
+       case DTT_TEMP_LOW:
+               dlen = 2;
+               data[0] = (uint8_t) (val >> 8); /* MSB first */
+               data[1] = (uint8_t) val;
+               break;
+       default:
+               return -1;
+       }
+       /*
+        * Write value to register at the calculated sensor address.
+        */
+       return 0 != i2c_write(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data,
+                             dlen);
+} /* dtt_write() */
+
+int dtt_init_one(int const sensor)
+{
+       int val;
+
+       /*
+        * Validate the Identification register
+        */
+       if (0x0190 != dtt_read(sensor, DTT_ID))
+               return -1;
+       /*
+        * Setup THIGH (upper-limit) and TLOW (lower-limit) registers
+        */
+       val = CONFIG_SYS_DTT_MAX_TEMP << 7;
+       if (dtt_write(sensor, DTT_TEMP_HIGH, val))
+               return -1;
+
+       val = CONFIG_SYS_DTT_MIN_TEMP << 7;
+       if (dtt_write(sensor, DTT_TEMP_LOW, val))
+               return -1;
+       /*
+        * Setup configuraton register
+        */
+       /* config = alert active low, disabled, and reset */
+       val = 0x64;
+       if (dtt_write(sensor, DTT_CONFIG, val))
+               return -1;
+       /*
+        * Setup control/status register
+        */
+       /* control = temp resolution 0.25C */
+       val = 0x00;
+       if (dtt_write(sensor, DTT_CONTROL, val))
+               return -1;
+
+       dtt_read(sensor, DTT_CONTROL);  /* clear temperature flags */
+       return 0;
+} /* dtt_init_one() */
+
+int dtt_get_temp(int const sensor)
+{
+       int const ret = dtt_read(sensor, DTT_READ_TEMP);
+
+       if (ret < 0) {
+               printf("DTT temperature read failed.\n");
+               return 0;
+       }
+       return (int)((int16_t) ret + 0x0040) >> 7;
+} /* dtt_get_temp() */